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The verbal stimulus When I say “three”, go! may have no immediate effect classifiable as a response, but it changes the subsequent behavior of the listener with respect to the stimulus Three . . . In a slightly different example, the later effect of a nonverbal stimulus is changed. Thus, When the fire burns out, close the Damper leads to subsequent behavior under the control of a nonverbal stimulus arising from the condition of the fire. Both of these examples are what might be called conditional mands . . . (pp. 358-359)